83 vmax with no top end !!

[improse]

This 83 I have wants to lay down at about 60 mph or quit pulling.From idle to 60+ it pulls very hard till it hits 60 mph. Any idea's ?? Thx

[Bob Vehring]

Unles something sounds ugly in the engine, I would look at clutching first.
Does it pull cleanly up to shift out speed, What is that rpm?

[Vmax540]

Unles something sounds ugly in the engine, I would look at clutching first.
Does it pull cleanly up to shift out speed, What is that rpm?

x2 !
Belt wear, C to C, offset, clutches in good condition and clean ?

http://www.vintagevmax.com/1986_service.htm
Drive- Engagement rpm/ Shift rpm 4000 +/- 200 rpm/ 8200 +/-200rpm
Belt Length/ Width/ Wear Limit/ IBM Number 1175mm/ 31.6mm/ 26mm/ 8M6
Sheave Center to Center/ Offset 305 +/-1.0mm/ 11 +/-0.5mm
Primary Spring Color/ Length/ Rate/ Preload Pink/ 75.5mm/ 2.31Kg-mm/ 32.8 Kg
Secondary Spring Preload/ Color/ Length 40� (C-2)/ Pink/ NA
Secondary Drive Ratio/ Chain Free play 18-33/ 10 +5 -2 mm
Track Width/ Tension 15 in/ 25~30 mm @ 10 Kg (1.0~1.2 in @ 22lbs)

[improse]

Belt does have alot of wear on it.You can see a little steel on top showing thru(lol).Tach is at about 6,500-7,000 at 60 mph.Clutch does engage at 4,000.Has a factory comet and looks to in very nice shape..thx

[Bob Vehring]

Looks can be decieving. I found the bushing in the arms worn out in my SRV a week ago, one arm was not really moving out.. If ot doesn't reach its full shift out RPM. it isn't going to be making power. check both clutches over carefully

[improse]

Guess you guys were right about checking over the clutchs very carefully.I'll be dam,looked at them like 5 times and never seen nothing wrong.Untill this morning,found the primary clutch spring broke.What color spring should I replace it with(pink)?
Thx !!

[Vmax540]

Read these.... viewtopic.php?f=2&t=1506